Iconic photos from the 9/11 tragedy

U.S. Navy

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A surveillance camera photographs suspected hijackers Mohammed Atta (R) and Abdulaziz Alomari (C) as they pass through airport security Sept. 11, 2001, at Portland International Jetport In Maine. Authorities say the two men took a commuter flight to Boston before boarding American Airlines Flight 11, one of the two jets that were crashed into the World Trade Center.

U.S. Navy

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A surveillance camera photographs suspected hijackers Mohammed Atta (R) and Abdulaziz Alomari (C) as they pass through airport security Sept. 11, 2001, at Portland International Jetport In Maine. Authorities say the two men took a commuter flight to Boston before boarding American Airlines Flight 11, one of the two jets that were crashed into the World Trade Center.